code: def tearDownClass(cls):
      ray.shutdown()
  
imports: import unittest
  import numpy
  import ray
  from ray.rllib.algorithms.callbacks import DefaultCallbacks
  from ray.rllib.algorithms.ppo import PPO, PPOConfig
  from ray.rllib.connectors.connector import ActionConnector, ConnectorContext
  from ray.rllib.evaluation.metrics import RolloutMetrics
  from ray.rllib.examples.env.debug_counter_env import DebugCounterEnv
  from ray.rllib.examples.env.multi_agent import BasicMultiAgent, GuessTheNumberGame
  from ray.rllib.examples.policy.random_policy import RandomPolicy
  from ray.rllib.policy.policy import PolicySpec
  from ray.tune import register_env
  from ray.rllib.policy.sample_batch import convert_ma_batch_to_sample_batch
  from ray.rllib.core.rl_module.rl_module import SingleAgentRLModuleSpec
  from ray.rllib.core.rl_module.marl_module import MultiAgentRLModuleSpec
  from ray.rllib.examples.rl_module.random_rl_module import RandomRLModule
  from ray.rllib.utils.test_utils import check
label_desc: Use image node_id 2 for calling the TestEnvRunnerV2 obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types